Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee3cfa9ac7248ae…

MALICIOUS

PDF

84.6 KB Created: 2021-07-19 14:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e797c4675e2de4770e984925379713ba SHA-1: 1a9ed25515c03ae77dbb5e4d8a452229b4d1ee8c SHA-256: aee3cfa9ac7248ae5a83b31d78a8eda411a0096b02b14edd7576a698de2629e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads, and ClamAV detected it as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document's structure and numerous external links suggest an attempt to redirect users to malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f35e59c15eb---kenara.pdf In PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/3399576645.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07044bf21f---mikapefakixatur.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501095938310819.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///98986206962.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9becb25ed1---ginanesoten.pdfIn PDF document text
    • https://airbays.com/userfiles/file/41089159519.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d63d863405a8c8b770f7857202bcbc05/zifefuwik.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd575cadf5c---97822684133.pdfIn PDF document text
    • http://canadanur.com/resimler/files/vegidomam.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e97f6ccb1084d7c89f9b37b0e864d30b/tuvopikelesiniwixubuzaw.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26a576879d---lemukebagufunezokoxin.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd51bb8e943---nomeninotuvomedoz.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/577cb277d76fac8677064ae017170d0d/zegokazinimobemowoxo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nezoletorifidisoge.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/xemixixunipifofibo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/27c3d408afe79da0399a6762ca881bd4/67253089881.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/jagid.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/monobis.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/lalug.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nakot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=things+with+the+letter+cPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 10276 bytes
SHA-256: a9da0dc4bc3d61f3201a8c9f6a71dcc1d8f7cc6764099b6d8d552ea5ace7928f
font_02_sfnt_off00011a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A16 17096 bytes
SHA-256: 5c16e66dd370f783d91666d5fa678183c617712eead949fe01fe5095354ffd67

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